Sometimes applications are behaving "normally" along strict definitions of HTTP statuses but under the surface, something is terribly wrong. In 2017, Checkr's most important API endpoint went down for 12 hours without detection. In this talk I'll talk about this incident, how we responded and explore how we've hardened our systems today with simple monitoring patterns.

A new Rails 6 application will install both Webpacker and Sprockets by default. Don't they solve the same problem? This article dives into why Sprockets lives on even though webpack has surpassed most of its features and why you might want to choose one over the other.

MRI Ruby's Global VM Lock: frequently mislabeled, misunderstood and maligned. Does the GVL mean that Ruby has no concurrency story or CaN'T sCaLe? To understand completely, we have to dig through Ruby's Virtual Machine, queueing theory and Amdahl's Law. Sounds simple, right?

Knowing how to write fast code is useful, but insufficient without knowing how to fix slow code. Let’s talk about the approaches that we can use to find slow code, fix it, and prove that our new solution is faster.

When your boss asks you what you did this week, how do you answer her? Do you look at your calendar for what meetings you attended? Do you search your git history for what commits you made? Do you look at your Jira board and see what issues you resolved?